The constitution of barbaloin. Pt. I / by H.A.D. Jowett and Charles E. Potter.
- Jowett, Hooper Albert Dickinson, 1870-1936.
- Date:
- [1905]
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: The constitution of barbaloin. Pt. I / by H.A.D. Jowett and Charles E. Potter. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![XC.—The Constitution of Barbaloin. Part I. By Hooper Albert Dickinson Jowett and Charles Etty Potter. Barbaloin, a crystalline substance obtained from Barbadoes aloes, was first isolated by Smith in 1850 and examined by Stenhouse [Phil. Mag., 1850, [iii], 37, 481), who assigned to it the formula Cl7H1807. With bromine water, it yielded a crystalline tribromo-derivative. It was further examined by Tilden (Trans., 1872, 25, 204 ; 1875, 28, 1270), who adopted the formula C16H1807, which was confirmed by Schmidt (Ber., 1875, 8, 1275). Tilden obtained a crystalline trichloro-derivative, C16H1507C13, an amorphous acetyl derivative (C = 58'6; H = 5’4 per cent.), and found that, by distillation with zinc dust, barbaloin yielded methylanthracene. When oxidised with nitric acid, oxalic, picric, and chrysammic (tetranitro-? 1 : 6-dihydroxy- anthraquinone) acids were formed, whilst with chromic acid aloexan- thiii, O15H10O6 (1 tetrahydroxymethylanthraquinone) (Trans., 1877, 32, 267), was produced. The latter when distilled with zinc dust yielded methylanthracene. Although Tilden did not propose any](https://iiif.wellcomecollection.org/image/b22401842_0005.jp2/full/800%2C/0/default.jpg)
